If DiMarco holds on to be the first-round leader, it will be the fourth time he's either be a leader or co-leader after a round. He did it after the first and second rounds of 2001 and after the third round of 2004.

He played in the final pairing of the 2004 Masters with Mickelson but shot 76 and tied for sixth. He had opened with 69-73-68.